A) Using home network router.
1)The file should be placed in root/var/mobile/documents folder.
If you have installous installed. Then placed it in installous/download folder.
Open installous - click download. The file will be there. Just click installed.
2) Placed file in cydia app install folder. Then reboot, cydia will installed the software for you.
But the software will be deleted after installation.
B) Using download manager. Mainly use for direct download by iphone
The file will be found in the download manager/ download directory.
You will have to copy file path to installous/download directory for installation.
Read here for more specific details
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